richardm6994
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| posted on 2/6/17 at 07:25 PM |
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ST170 Supercharger project
As a bit of inspiration to anyone contemplating a supercharger project, I'd just thought I'd share some photo's from my latest
project - Eaton MP62 Supercharger on a ST170 engine inside a GBS Zero;
Close up of alternator bracket;
Charger mocked up in the engine bay
GTIR Plenum back plate being machined
Finished GTIR Plenum back plate
Supercharger Outlet plenum being machined
Finished Supercharger outlet plenum
Freshly rebuilt supercharger c/w precharger throttle body and BMW bypass valve
Supercharger crammed into the engine bay
Jenveys refitted (very tight)
Intake plenum fitted and boost pipes connected
Almost fits under the bonnet
And finally a little video showing 10psi of boost, although in desperate need of a rolling road....
https://www.youtube.com/watch?v=psF5AD8G8Vw
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bi22le
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| posted on 2/6/17 at 10:38 PM |
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Nice build, something I am still hoping to do.
Questions:
So you have a pre SC butterfly and Jenvey TBs, are these both cable operated and off of the same cable?
Are you limiting the SC to 10psi with pulley ratios ordoes it naturally make that and no more?
Are you only running a rerecirc and no blow off valve?
Do you have the SC clutch fitted and do you activate it at any time?
What is the expected hike in power?
Track days ARE the best thing since sliced bread, until I get a supercharger that is!
Please read my ring story:
http://www.locostbuilders.co.uk/forum/13/viewthread.php?tid=139152&page=1
Me doing a sub 56sec lap around Brands Indy. I need a geo set up! http://www.youtube.com/watch?v=EHksfvIGB3I
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big_wasa
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| posted on 3/6/17 at 08:26 AM |
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I love your work on the mill.
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richardm6994
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| posted on 3/6/17 at 09:15 AM |
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Thanks,
The precharger TB and the jenveys each have their own throttle cable going back to the pedal. You can't allow the precharger tb to close fully,
it needs about 3or4mm of opening when closed.
from memory, the zetec crank pulley is 126mm dia. Using a 65mm charger pulley on the last 2 project gives peak boost between 10 and 11 psi.
I have also experimented a 55mm supercharger pulley, and this saw 12-13psi. This really is the smallest you can go because any smaller you can't
stop the belt from slipping. Also, zetecs are good for up to 11psi in standard internals so unless you've uprated the insides, you
wouldn't want any more than 10-11psi.
Only running the BMW mini bypass valve. This is a must as without it, the noise is horrendous at closed throttle.
Never used the supercharger clutches. The main reason is the standard clutch pulley is 100mm dia and realistically, I think it could only be reduced
to 80(ish) and so the charger pulley ratios wouldn't be great (a lot of work for 5 or 6 psi)
On a 2ltr engine, the chargers I've done have added 60-80 bhp, however it's the torque figures which really impress. The owner of the last
charger I did described the engine characteristics as a cross between a v8 and straight 4.
Im always happy to help anyone with their projects be it guidance or full on machining. All the best
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richardm6994
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| posted on 3/6/17 at 09:33 AM |
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This is the rolling road graph from the last supercharger project - 10.5psi, 245bhp and 213ftlbs from a fairly standard silver top engine.
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bi22le
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| posted on 3/6/17 at 08:07 PM |
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Thanks for the info.
Hopefully Ill crack on with mine one day.
Track days ARE the best thing since sliced bread, until I get a supercharger that is!
Please read my ring story:
http://www.locostbuilders.co.uk/forum/13/viewthread.php?tid=139152&page=1
Me doing a sub 56sec lap around Brands Indy. I need a geo set up! http://www.youtube.com/watch?v=EHksfvIGB3I
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ChrisL
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| posted on 17/1/18 at 10:31 AM |
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Hi Richard,
Thanks for the pic's and write up. I am doing a similar thing, M62 on a Blacktop 2 ltr Zetec and you've given me some good info.
Would be interested to know if you'd be interested in making me an alternator and supercharger mounting brackets?
Thanks
Chris
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ChrisL
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| posted on 23/2/18 at 10:10 AM |
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One question, have you used a decompression plate?
Cheers
Chris
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richardm6994
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| posted on 23/2/18 at 10:29 AM |
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No need for decompression plate on zetecs with low boost.
I’ve heard 14psi is safe on standard internals and compression for zetecs but not gone this high myself, my chargers only go up to 12psi and all have
been fine on standard internals and compression.
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richardm6994
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| posted on 23/2/18 at 10:38 AM |
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Here is the dyno which it gave 267wbhp
https://youtu.be/RwiAMIH7RDw
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Simon
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| posted on 23/2/18 at 08:09 PM |
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Nice 
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ChrisL
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| posted on 24/2/18 at 09:25 PM |
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Thanks Richard, aiming for the same PSI so should be good.
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ChrisL
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| posted on 4/3/18 at 04:56 PM |
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So this is the plan for the pulley, bore the centre out so it will sit over the nose bearing:
Bearing:
 
Description
Pulley
 
Description
Then trip the top hat down and put some bolts through into the bored and tapped pulley.
Top hat:
 
Description
So anyone got a lathe in the north herts/beds area?
Cheers
Chris
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richardm6994
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| posted on 4/3/18 at 05:15 PM |
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That’s exactly what I’ve done on my charger projects.
Just a word of advice when machining the pulley:- don’t use a 3jaw chuck as it wont be accurate enough. 4jaw chuck and plenty of patience with a dti
is essential.
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ChrisL
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| posted on 6/3/18 at 06:21 PM |
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Thanks for the advice.
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ChrisL
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| posted on 24/4/19 at 09:53 AM |
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Another question from me, what injectors are you running, I'm thinking 440cc....
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theduck
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| posted on 24/4/19 at 11:59 AM |
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440cc are safe to about 275bhp in supercharged 4cylinder applications, though you can squeeze a bit more from them if needed.
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ChrisL
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| posted on 24/4/19 at 01:36 PM |
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good to know, I guess I'm looking at a couple of hundred for some bosch one then..
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theduck
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| posted on 24/4/19 at 02:28 PM |
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Impreza "baby blue" are a nice option for 440cc, used at around £40-50 Can also get impreza "pinks" and "dark
blue" which are 540-550cc for around £100.
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ChrisL
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| posted on 7/5/19 at 08:25 AM |
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Getting close to first attempt at starting, just need to fit 2 more fuel lines, an alternator belt and the last bit of the air way. I would put up a
picture but seem to be having technical issues. One more question I have, bearing in mind my build is on a 2 ltr black top Zetec, should I fit ARP
conrod bolts?
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theduck
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| posted on 7/5/19 at 08:57 AM |
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Not sure how required they are, but I know a couple of guys who have done budget turbo builds and they both fitted them.
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big_wasa
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| posted on 7/5/19 at 06:27 PM |
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I’ve fitted Arp’s to mine as a little extra insurance.
Also running mk1 Rs 440cc injectors as there not to dear new.
Re photos, it’s a case of re sizing them ( as this site doesn’t ) and hosting them on a third party site. Imgur seems ok while it lasts.
[Edited on 7/5/19 by big_wasa]
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ChrisL
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| posted on 7/5/19 at 07:07 PM |
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ARPs it is then, which is a pain as I've just put fresh oil in!!
I've gone for the Bosch greens which are in.
Re the photos, I've tried resizing down to the same size as other images I've uploaded but am still getting SQL errors. I'm sure
it'll get fixed at some point.
Currently looking at clutch options, I think I need a 23 spline (type 9) and 220mm Zetec silver top 1.8 fly wheel.
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furryeggs
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| posted on 7/5/19 at 07:31 PM |
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How/where is the SC bolted to the side of the block?
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big_wasa
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| posted on 7/5/19 at 07:35 PM |
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Re photos, the forum is broken you have to host them on a third party site.
Re the clutch, Depending on the spec of your engine/clutch you may struggle with it holding the torque of a blown engine. I’ve gone for a 240mm Rs
spec steel flywheel and Focus Rs clutch.
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